One of the mysteries of the English language finally explained.
Of the nature of or relating to a pinacoid; = pinacoid; specifically designating a triclinic crystal form having a centre of symmetry; (of cleavage) occurring parallel to one of the pinacoidal surfaces of a crystal.
Late 19th century; earliest use found in Frank Rutley (1842–1904), geologist. From pinacoid + -al.
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